 The students will add and subtract fractions with like denominators.  The students will simplify fractions.  The students will find least common denominators.  The students will find a common denominator to add and subtract fractions with unlike denominators.

2.1 Numbers, Number Systems and Number Relationships  D Use models to represent fractions.  G Develop and apply number theory concepts to represent numbers in various ways. 2.2 Computation and Estimation  C Develop and apply algorithms to solve word problems that involve addition and/or subtraction with factions that include like and unlike denominators

 Copy the Denominator  Add the top

Are you ready to add and subtract fractions with common denominators?

If you can count by a number other than 1 to reach both parts of the fraction!

Time to Practice!!!!

 Make a list of multiples for each denominator.  Circle the common multiples.  What is the least common denominator???

Let’s practice finding the least common denominators!

 Set-up the Problem  Finding the

 Find the common denominator  Make equivalent fractions  Copy the denominator  Add the top

Are you up to the challenge???

 Slide 1 and 9 Math Mastery: Fractions. Math Mastery (2001). Retrieved November 4, 2008, from Discovery Education:  Slide 6 Example 1: Adding Fractions with a Common Denominator--Baking Cake. Discovery Channel School (2005). Retrieved November 4, 2008, from Discovery Education:  Slide 15 Example 3: Adding Fractions with Different Denominators--Serving Salsa. Discovery Channel School (2005). Retrieved November 4, 2008, from Discovery Education: